logiguard fork v3: full patch set on verified 8c74db0 tree

Includes prior-session patches (carry forward so the app compiles):
  - crates/gpui/build.rs: cross-compile manifest fix
  - crates/gpui/src/platform.rs: PlatformWindow::activate_with_token trait method
  - crates/gpui/src/window.rs: Window::activate_with_token public API
  - crates/gpui_linux/src/linux/wayland/window.rs: WaylandWindow::activate_with_token + activate() keyboard-serial fix

Plus the focus-serial fix:
  - serial.rs: SerialKind::KeyboardEnter
  - client.rs: store wl_keyboard.enter serial; latest_serial_of()

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

nix/toolchain.nix

@@ -0,0 +1,10 @@
+{ inputs, ... }:
+pkgs:
+let
+  rustBin = inputs.rust-overlay.lib.mkRustBin { } pkgs;
+in
+pkgs.callPackage ./build.nix {
+  crane = inputs.crane.mkLib pkgs;
+  rustToolchain = rustBin.fromRustupToolchainFile ../rust-toolchain.toml;
+  commitSha = inputs.self.rev or null;
+}